export interface BoundedJsonlLimits {
    maxBytes: number;
    targetBytes: number;
    maxRecords: number;
}
/** Append one JSON record and rotate to the newest low-water tail under one exclusive lock. */
export declare function appendBoundedJsonLineSync(filePath: string, value: unknown, limits: BoundedJsonlLimits): void;
/** Async counterpart of {@link appendBoundedJsonLineSync}. */
export declare function appendBoundedJsonLine(filePath: string, value: unknown, limits: BoundedJsonlLimits): Promise<void>;
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